Geoege wilson



(Model.) 7 2 Sheets-Sheet l.

G. WILSON Adjustable Surgical and Invalid Chair.

Patented June 7,1881.

g 6c s, X/;

9. i M41 (Ma /i (M0del.) 2 Sheets-Sheet 2.

G; WILSON. Adjustable Surgical and Invalid Chair. No. 242,573. Patented June 7,1881.

[dak

N. PETER$ mmuem n m, wnmngmn. 0. z;

Nrrn TATES ATENT Orrrc GEORGE WILSON, OF BROOKLYN, NEW YORK.

ADJUSTABLE SURGICAL AND INVALID CHAIR.

SPECIFICATION forming part of Letters Patent No. 242,573, dated June 7, 1881.

Application filed May 8, 1880. (Model) Patented in England March 16, 1878.

To all whom tt may concern:

Be it known that LGnonen WtLsoN, of Brooklyn, in the county of Kings and State of New York, have invented a new and useful Improvement in Adjustable Surgical and Invalid Chairs; and I do hereby declare that the following is a trueand accuratedescription thereof, reference being had to the accompanying drawin gs, and to the letters ofreference marked thereon, and being a part of this specification.

Figure 1 is a perspective view. Fig. 2, Sheet 2, is a sectional elevation of the mechanism for raising and lowering the chair in its leg-frame. Fig. 3 is a side elevation, looking from the interior, of the mechanism for running the chairback out or in, giving the required seat-space. Fig. 4 is a side elevation of the mechanism for tipping the whole chair-body to any angle required. Fig. 5 is a sectional side elevation of the mechanism for throwing the leg-sections out or in as required. Fig. 6 is a similar view of the mechanism for tipping the chair-back to any angle.

The nature of my invention relates tolhe construction of a chair the various parts of which can be adjusted to such positions as may be required or convenient for surgical operations, or that may be the most comfortable to an invalid occupant, for which I have obtained English Letters Patent dated March 16, 1878, No. 1,043.

The invention consists, first, in the mechanism whereby the ehair-seat is raised, lowered, or inclined in the leg-frame; second, in the mechanism for tilting the back-frame; third, in the mechanism for giving inclination and adjustment to the leg-sections; and, fourth, in the peculiar construction and arrangement of the various parts, as more fully hereinafter set forth.

In the drawings, A represents the supporting or leg frame of my chair, mounted upon casters, and having in each side a guide-bar, B, and across the bottom a girder or strengthening-rod, O.

D is the seat-frame, having secured to each side the pendent lugs I), to which are pivoted the guides E, which embrace and slide on the bars B. Beneath the seat-frame there are senear the tops thereof, the inwardly-projectin g brackets to. Through these brackets there aretapped the screw-bolts F, their lower ends being threaded through the upper ends of the supporting-brackets G, which latter are rigidly secured to the leg-frame and girder (3. Upon the upper end of these screw-bolts F are keyed bevel-pinions H, which engage with similar pinions, I, keyed upon the shaft J, which is j ournaled transversely through the upper ends of the guides E and lugs I), one end of said shaft projecting sufficiently to receive and be actuated by a crank-handle.

ltigidly secured to the lower ends of the guides E are the rearwaidly-projecting frames K, having longitudinally journaled through them the shafts L. One end of these shafts is provided with wormgears M, which engage with segmental racks N secured to the semicircular side frames, 0, pendent from the seat-frame. Upon the outer ends of these shafts L are keyed bevel-pinions P, which engage with similar pinions, R, keyed upon the shaft S, journaled through the rear ends of the frame K, said shaft projecting outside of the frame upon one side to receive a crank-handle, by means of which motion is imparted to the va rious parts of this mechanism, and through them a rocking or tilting of the chair.

T is the back-frame, pivoted to the upper ends of the sliding brackets U, which are an ranged to slide upon the side rails of the seatframe. Through forwardly-projecting arms of these brackets is transverselyjoiu-naled ashaft, V, upon which are keyed gear-wheels W, which engage with the racks A, secured to the inner faces of the side rails of the seat-frame. By revolving this shaft with its gears the backframe can be moved forward or back, as may be desired, thus shortening or lengthening the seat-space.

Pivoted in the brackets U are the quadrantgears B, the rear upper corner of each being, in turn, pivoted to the side rails of the backframe. J ournaled longitudinally through the lower part of these brackets are shafts D, provided wit-h worm-gears E and bevel-gearsF. The worm-gears E engage with the quadrantgears B, while the gears F engage with beveled gears G, keyed on the shaft H, which is transversely j ournaled through forwardly-projecting arms of the brackets, as shown.

Armrests I are -p'voted at one end to the side rails of the bac and are adjustable by means of the notched segmental bars J, which engage with suitable stops upon the side bars of the back-frame.

K is a shaft journaled transversely across the seat-frame in a bar, K rigidly secured to and beneath the seat-frame, and has keyed upon it the bevel-pinions L, which engage with the pinions M, keyed upon the screw-shaft N, journaled through inwardl y-projectin g studs d from the bar K.

O are the leg-sections or frames, pivoted at their upper ends to the seat-frame, at e, by means of the yokes P. Pivoted to the under side of each leg-frame is a bifurcated connecting-bar,R, the ends of which engage with loops fin the lower end of the hanging frame S, which is sleeved upon the front round of the seat-frame.

Pivoted to the frame S are arms T, which carry at their inner ends outwardly-projectin g studs g, through which the screw-shafts N are threaded. By this last-described mechanism the leg-sections can be adjusted to any desired position.

By means of a crank-handle applied to the various shafts the chair can be readily adjusted to any position as may be required for surgical operations.

What I claim as my invention is- 1. The combination, with the seat-frame D, of the shafts J F for raising the same bodily, and the semicircular side frames, 0, cog-segments N, and screw-shafts L, for tilting such seat-frame, substantially as described and shown.

2. The combination, with the back-frame T, pivoted at its lower end to blocks U, sliding on the seat-frame, of the quadrants B, pivoted to the sliding blocks U, the connecting-arms C, and the worm-shafts D, constructed and arranged substantially as described and shown.

3. The combination, with the leg-sections 0, of the mechanism for operating them, consistin g of the frames S, connected to the said legsections, the transverse shaft K, screw shafts N, beveled pinions L M, arms T, and screwstuds 9, constructed and arranged substantially as described and shown.

GEORGE WILSON.

Witnesses ISAAC S. SIGNOR, W. (3. BEEOHER. 

